The expected enrollment for the upcoming school year is 353,014, down from last year's 360,676.

"While these steps are part of the normal annual staff movement between schools, CPS recognizes that our school communities will feel the impact of these changes," according to a CPS statement. "After all staff have been notified, the district will provide a full school-by-school breakdown of the personnel impacts."

CPS said 240 elementary school teachers and 116 high school teachers will lose their positions as part of the layoffs. Additionally, 134 elementary school support personnel and 466 high school support personnel will be laid off.

Among the layoffs affecting teachers: 258 are full-time regular teachers; 34 are part-time teachers; 13 are bilingual teachers; 10 are counselors; three are program option teachers; and eight are categorized as "other." (One of the teachers in that list is counted twice because that person worked at two schools.)

Support staff being laid off include 174 regular teachers assistants and 82 special education classroom assistants.

CPS notes that layoffs occur before every school year because of expected changes in enrollment and school programs. About 60 percent of laid-off teachers find another position at a CPS school.